Heat 5 tbsp of butter in a large skillet over medium heat. Add mushrooms and saute for 3 minutes. Stir in flour, and continue to stir until flour has become creamy. Stir in cajun seasoning and stir until everything is thoroughly mixed.
Add heavy cream, chicken broth, sherry wine and smoked paprika. Stir together and bring to a hard simmer. Reduce heat to low, and let simmer for 10 minutes, stirring occasionally.
Season salmon on both sides with seasoning. In a small bowl, season shrimp with the same seasoning.
In another skillet, heat 1 tbsp of butter and 2 tbsp vegetable oil over medium to medium-high heat. Cook salmon fillets for 4 minutes on each side. Remove salmon and set aside on a plate. Add shrimp to same skillet and cook for 3 minutes on each side. Do not overcook shrimp.
Remove lid from sauce, and add pepper jack cheese. Stir until cheese is melted. Add spinach and stir until spinach is wilted.
Serve immediately on top of salmon and shrimp with sides of choice. Mashed potatoes and asparagus are recommended.